diff --git a/AltServer/Anisette Data/LocalAnisetteDataManager.swift b/AltServer/Anisette Data/LocalAnisetteDataManager.swift
index 8791646759..c7da879361 100644
--- a/AltServer/Anisette Data/LocalAnisetteDataManager.swift	
+++ b/AltServer/Anisette Data/LocalAnisetteDataManager.swift	
@@ -20,6 +20,13 @@ private extension URL
     static let unzip = URL(fileURLWithPath: "/usr/bin/unzip")
 }
 
+private extension String
+{
+    // AnisetteKit provisions an Android device, and GrandSlam now rejects sign-in with -80045
+    // when X-MMe-Client-Info describes a Mac instead.
+    static let androidClientInfo = "<Pixel 7> <Android;14;UQ1A.240205.002> <com.apple.AuthKit/1 (com.apple.akd/1.0)>"
+}
+
 // Swift wrapper around AnisetteKit to generate anisette data when macOS won't provide it.
 class LocalAnisetteDataManager
 {
@@ -155,7 +162,7 @@ private extension LocalAnisetteDataManager
                                routingInfo: routingInfo,
                                deviceUniqueIdentifier: identifier.uuidString.uppercased(),
                                deviceSerialNumber: AnisetteConstants.defaultSerialNumber,
-                               deviceDescription: client.clientInfo,
+                               deviceDescription: .androidClientInfo,
                                date: Date(),
                                locale: .current,
                                timeZone: .current)
diff --git a/AltServer/AppDelegate.swift b/AltServer/AppDelegate.swift
index 8b3abb6d43..b57a904293 100644
--- a/AltServer/AppDelegate.swift
+++ b/AltServer/AppDelegate.swift
@@ -61,6 +61,17 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         ServerConnectionManager.shared.start()
         ALTDeviceManager.shared.start()
         
+        // Apple rejects one-time passwords that were already used, so let AltSign ask for new anisette data between sign-in steps.
+        ALTAppleAPI.shared.anisetteDataRefreshHandler = { (completionHandler) in
+            AnisetteDataManager.shared.requestAnisetteData { (result) in
+                switch result
+                {
+                case .failure(let error): completionHandler(nil, error)
+                case .success(let anisetteData): completionHandler(anisetteData, nil)
+                }
+            }
+        }
+        
         #if STAGING
         SUUpdater.shared().feedURL = URL(string: "https://altstore.io/altserver/sparkle-macos-staging.xml")
         #else
diff --git a/Dependencies/AltSign b/Dependencies/AltSign
index 0d3c1a3cac..780f7cfb9b 160000
--- a/Dependencies/AltSign
+++ b/Dependencies/AltSign
@@ -1 +1 @@
-Subproject commit 0d3c1a3cac608e724ca0c8d7404253cd5fee9495
+Subproject commit 780f7cfb9b0dab1189fb8fcdaaa31f005cfab597